Final space station assembly mission. Also delivered spare parts. Endeavour docked with the Station at 10:14 GMT on 18 May. The ELC-3 carrier was unberthed from the shuttle at 13:27 GMT and installed on the Station's truss at 16:09 GMT. The AMS-02 Alpha Magnetic Spectrometer was unberthed at 06:59 GMT on 19 May and bolted to the Station's S3 truss at 09:46 GMT. Cargo Bay Manifest:

EVA STS-134-4 - .
Crew: Chamitoff,
Fincke.
EVA Duration: 0.31 days. Nation: USA.
Program: ISS.
Flight: Soyuz TMA-21,
STS-134.
Moved the Orbiter Boom Sensor System from the shuttle to an ISS truss. Completed other external work on the Dextre arm and the PMM module. This EVA completed assembly of the US segment of the ISS..